Incandescent-lamp.



T. B. RIDER.

INCANDESCENT LAMP. APPLICATION FILED luv 2. 1911.

1,259,907. Patented Mar. 19, 1918.

- wlfggs INVENTOR W 7M 76 ATTORNEY UNITED STATES PATENT OFFICE.

THOMAS B. RIDER, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGNMENTS,

OF ONE-HALF T0 GEORGINA DE CASTRQ-D1=NZTGER ANGELES, CALIFORNIA.

Specification of Letters Patent.

NEE McCLELLAN), on LOS INCANDESCENT LA MP.

Patented Mar. 19, 1918.

Application filed May 2, 1917. Serial No. 165,932.

.new and useful Improvements in Incandescent Lamps, of which the following is a specification.

My invention relates to improvements in incandescent lamps; and the objects of my improvements are, to provide an electric lamp which inserts automatically anew filament when one of the first burning lilaments burns out or breaks, to provide a lamp in which the candle-power of the light can be increased while the lamp is burning, to provide a lamp in which a new set of filaments can be inserted into the circuit after the normally burning set has been used up, to provide a lamp with a threefold burning capacity; to provide a lamp with three independent sets of filaments, one ofwhich be 'ing normally inserted into the circuit, the second set being automatically inserted when the first set is burned out or broken, and I the third set being arranged to'bef inserted manually after the other two sets have been used up, the invention-consisting in the construction, combination and arrangement of' devices hereafter more fully described and claimed, and illustrated in the accompanying drawing, in which- Figure 1 is a side view of a lamp with a fragmentary vertical sectional view ofa portion of my device inserted.

Fig. 2 is a diagram of the filament con nections in my device.

Similar numbers refer to similar parts throughout these papers.

In Fig. 1, 3 designates the insulation body to which the several parts of alamp are socured. The base plate 4 forms one of the terminations or poles of the wiring in the lamp,-the wire 5 being shown as secured at .6 to thebase plate. 7 The screw sleeve 7-forms another termination or pole of the wiring in the lamps, the wire 8 being shown as secured to the sleeve at 9. A second sleeve 10 is secured to the insulation body 3 forming another termination or pole in the lamp insulated from the screw sleeve to which the wire llis secured at 12. A sliding contact 13 is mounted on the second sleeve 10 ha ving an extension 14 which is provided to non-conducting rims 19 and 20.

make a connection between the second sleeve 10 and the screw sleeve 7 \-vhene\'er the slidmg contact 13 moved in the direction and overva contact 15, provided on the screw sleeve at a suitable place. An insulation stem 16 is formed within the globe'l? of the lamp on the insulation bodytern'iimlting in the support 18. A number of rims 1f), 20,

21, 22, 23 and 2-1 are formed on the support 18 for securing the several filan'ienls. A conductor ring is disposed between the Another coni'luctor-ring 26 is disposed between the non-conducting rims 22 and 23, and a third conductor ring 27 is disposed between the non-conducting rims 23 and- 24. Eight supports are secured to each of the rings and 27, and four supports are secured to the ring 26, the several supports being designated by the numerals 28, 29, 30, 31 and 36, see Fig. 2. The filaments 34 are inserted hetwecn the supports 28 on ring 27 and the supports 30 on ring 25. The filaments 35 are secured on the upper end to the supports en the ring 27 and are provided on the lower ends with the extension end 32 terminating in the pans The four supports, secured to the ring 26, are designated by the numorals- 36, and another set of filaments 37 are inserted between the supports 36 on the upper ends and wi'th the lower ends to the supports 31 on the ring 25.

The burning out or breaking of the filaments 3% causes the supports 30 to dro on to the pans 33 on the extension ends 0 the filaments 35 and thereby forms a new circuit,

the first or original circuit being through the wire 5, rin 25, supports 30, filaments 34, supports 28, ring 27 and wire 8; while the new circuit is formed through supports 30, pans 33, extension ends 32, filaments 35, supports 29, and farther on again through ring 27, etc., as before.

This arrangement produces a life of double the length of the usual'lamps and automatically inserts a new filament for a broken one until all the filaments are used up.

The rest of the filaments are normally not insertedin the circuit of the lamps as the wire 11 terminates in the sleeve 10, which is insulated from the screw ring 7, but by shifting the sliding contact 13, the full set of fila-- ments 37 can be inserted to burn simultaneously with the original set of filaments 34, or, after this first set has been used up, with the second set of filaments 35 through ring 25, supports 31, filaments 37, supports 36, ring. 26, wire l1,sliding contact 13 and extension 14, and through the contact 15 back to'the screw sleeve 7. But this set of fila ments can also be used as an auxiliary set after the first two sets have been used up, as Will easily be understood.

It will furthermore be understood that each set of filaments can contain any suitable number of filaments, even though each is illustrated with only four sets in the drawing.

Having thus'clescribed my invention, I claim An incandescent .lamp comprising a stem, a suitable number of filaments mounted on the stem forming a normally closed circuit in the lamp, a second set of filaments also mounted on the stem forming a normally open circuit having contacts projecting beneath the filaments in the first named set for automatically taking the place of the first named filaments when such first named filaments break and fall upon the contacts of the second named filaments, and a third set of filaments also mounted on the stem insulatedfrom the first and second sets of filaments forming a normally open circuit in the lamp having a contact .for manually inserting the third set of filaments into the circuit of the normally closed circuit.

In testimony whereof, I hereunto aflix my signature.

THOMAS B. RIDER. 

